Income Taxes (Details) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Income Tax Disclosure [Abstract]
Provisional income tax benefit recognized related to revaluation of deferred income tax assets and liabilities		$ 36.4
Provisional income tax charge recognized for federal and state income taxes		11.4
Undistributed earnings of foreign operations	$ 10.4	$ 10.4
Deferred income tax benefit	$ 2.7
Federal statutory tax rate for fiscal year September 30, 2018	24.50%	24.50%
Federal statutory tax rate thereafter		21.00%

Effective income tax rate reconciliation at federal statutory income tax rate thereafter.

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

+ References

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-Publisher FASB
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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